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virt-dt: Allow reservation of secure region when in a RAM carveout

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In this case the secure code lives in RAM, and hence the memory node in
the device tree needs to be adjusted. This avoids that the OS will map
and possibly access the reservation.

Add support for setting CONFIG_ARMV7_SECURE_RESERVE_SIZE to carve out
such a region. We only support cutting off memory from the beginning or
the end of a RAM bank as we do not want to increase their number (which
would happen if punching a hole) for simplicity reasons

This will be used in a subsequent patch for Jetson-TK1.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Jan Kiszka 2015-04-21 07:18:32 +02:00 committed by Tom Warren
parent bfb2c8d35d
commit d6b72da029
3 changed files with 36 additions and 0 deletions
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29
arch/arm/cpu/armv7/virt-dt.c
View file

@ -16,6 +16,7 @@
*/
#include <common.h>
#include <errno.h>
#include <stdio_dev.h>
#include <linux/ctype.h>
#include <linux/types.h>
@ -88,6 +89,34 @@ static int fdt_psci(void *fdt)
return 0;
}
int armv7_apply_memory_carveout(u64 *start, u64 *size)
{
#ifdef CONFIG_ARMV7_SECURE_RESERVE_SIZE
if (*start + *size < CONFIG_ARMV7_SECURE_BASE ||
*start >= (u64)CONFIG_ARMV7_SECURE_BASE +
CONFIG_ARMV7_SECURE_RESERVE_SIZE)
return 0;
/* carveout must be at the beginning or the end of the bank */
if (*start == CONFIG_ARMV7_SECURE_BASE ||
*start + *size == (u64)CONFIG_ARMV7_SECURE_BASE +
CONFIG_ARMV7_SECURE_RESERVE_SIZE) {
if (*size < CONFIG_ARMV7_SECURE_RESERVE_SIZE) {
debug("Secure monitor larger than RAM bank!?\n");
return -EINVAL;
}
*size -= CONFIG_ARMV7_SECURE_RESERVE_SIZE;
if (*start == CONFIG_ARMV7_SECURE_BASE)
*start += CONFIG_ARMV7_SECURE_RESERVE_SIZE;
return 0;
}
debug("Secure monitor not located at beginning or end of RAM bank\n");
return -EINVAL;
#else /* !CONFIG_ARMV7_SECURE_RESERVE_SIZE */
return 0;
#endif
}
int psci_update_dt(void *fdt)
{
#ifdef CONFIG_ARMV7_NONSEC

1
arch/arm/include/asm/armv7.h
View file

@ -134,6 +134,7 @@ void v7_outer_cache_inval_range(u32 start, u32 end);
#ifdef CONFIG_ARMV7_NONSEC
int armv7_init_nonsec(void);
int armv7_apply_memory_carveout(u64 *start, u64 *size);
bool armv7_boot_nonsec(void);
/* defined in assembly file */

6
arch/arm/lib/bootm-fdt.c
View file

@ -17,6 +17,7 @@
#include <common.h>
#include <fdt_support.h>
#include <asm/armv7.h>
#include <asm/psci.h>
DECLARE_GLOBAL_DATA_PTR;
@ -31,6 +32,11 @@ int arch_fixup_fdt(void *blob)
for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
start[bank] = bd->bi_dram[bank].start;
size[bank] = bd->bi_dram[bank].size;
#ifdef CONFIG_ARMV7_NONSEC
ret = armv7_apply_memory_carveout(&start[bank], &size[bank]);
if (ret)
return ret;
#endif
}
ret = fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);